[igt-dev] [PATCH i-g-t 2/4] lib/igt_kmod.c: check if module is builtin before attempting to unload it

[Dominik Karol Piatkowski <dominik.karol.piatkowski@intel.com>]

From: Isabella Basso <isabbasso@riseup.net>

This change makes `igt_kmod_unload_r` safer as it checks whether the
module can be unloaded before attempting it.

v2 -> v3:
- Fix commit message
- Make return value clearer

Acked-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
Signed-off-by: Isabella Basso <isabbasso@riseup.net>
---
 lib/igt_kmod.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/igt_kmod.c b/lib/igt_kmod.c
index 0b714ce3..fbda1aa6 100644
--- a/lib/igt_kmod.c
+++ b/lib/igt_kmod.c
@@ -259,6 +259,9 @@ static int igt_kmod_unload_r(struct kmod_module *kmod, unsigned int flags)
 	int err, tries;
 	const char *mod_name = kmod_module_get_name(kmod);
 
+	if (kmod_module_get_initstate(kmod) == KMOD_MODULE_BUILTIN)
+		return 0;
+
 	holders = kmod_module_get_holders(kmod);
 	kmod_list_foreach(pos, holders) {
 		struct kmod_module *it = kmod_module_get_module(pos);
-- 
2.34.1